New Old Stock John Deere GP Cylinder Block C301R AC257R. The cylinders are perfect and coated with cosmoline to keep them that way. I did clean a small area to show the surface. This is the 5-3/4 inches bore and is for the GP and GP Wide-tread models 1928 - 1931. Asking $2800.00 cash. Please message, email, text, or call if interested. I have Verizon " no signal " so please keep trying.